The outermost wall of an artery or vein is called the ________ and in large arteries and veins contains the ________.
A. tunica media; smooth muscle
B. tunica externa; valves
C. tunica intima; endothelium
D. tunica intima; basement membrane
E. tunica externa; vasa vasorum
Answer: E
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When potassium channels open and the ions diffuse through the membrane,
A) the inside of the membrane will become more positive. B) the inside of the membrane will become more negative. C) there will be almost no effect on transmembrane potential. D) the membrane will become depolarized. E) the membrane will depolarize to threshold.
Compared to its partial pressure in the atmosphere, oxygen's partial pressure in the alveoli is
A. higher. B. lower. C. equivalent.
Which type of receptor is sensitive to changes in blood pH?
A) baroreceptors B) proprioceptors C) photoreceptors D) chemoreceptors E) mechanoreceptors
In the systemic circuit, which of these best describes active hyperemia?
A. increased metabolic activity that results in vasoconstriction B. increased metabolic activity that results in vasodilation C. decreased blood flow to tissues that results in vasoconstriction D. decreased blood flow to tissues that results in vasodilation E. increased blood pressure that drives blood more rapidly through tissues